This error is caused by not configuring the Proxy settings within the InfraStruXure (ISX) Manager. Verify that the ""Proxy Enabled"" box is checked and that the correct ""Host"" and ""Port Number"" have been entered. Make sure that the Username and Password for the proxy is setup correctly in ISX Manager. The proxy settings are set under the ""System Management-->Network--->Proxy Settings"" menu.

Finally, make sure that the proxy server allows connection from the network segment where ISX Manager and the APC devices are installed. The proxy settings are set under the ""System Management-->Network--->Proxy Settings"" menu.